FORCING YOURSELF TO SMILE CAN REDUCE STRESS.

The heart rates of people who were recovering from the stress of tracing a star with their non-dominant hands were 7% slower if they gripped a pair of chopsticks in their teeth in such a way as to force themselves to smile. While researchers acknowledged that the generalizability of their findings is questionable given the artificiality of the setting, they say the study shows there are physiological and psychological benefits from maintaining a positive facial expression during stress.

Harvard Business Review
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